Mold



Dec. 16, 1924. 1,519.11@

M. s. CLAWSON MOLD Filed-March 14 1923 WWW /ya rae C91 @Zan/:3%

Patented Dec. 16, 1924.

UNITED STATES PATENT OFFICE.

MOLD.

Application filed March 14, 1923.

T0 all whom it may concern:

Be it known that I, MONROE S. CLAwsoN', a citizen of the United States, residing at Upper Montclair, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Molcls, of which the following is a specification.

This invention relates to the metal founding art, )articularly to molds, and has for its object the provision of a mold equipped with a` gate or dam where the runner enters the mold cavity, the purpose being to deiicct downwardly the stream of molten r metal and prevent the formation of air pockets in any part of the casting.

It is well known in the art that a large percentage of castings are valueless on account of the presence of sir pockets which may occur at any point in the casting. The exact reason is a difiicult matter to determine but the fact remains that when the inolten meta-l passes from the runner into the mold eavity, the metal seems to pass across the top of the mold cavity and imprison a certain quantity of air there-in instead of allowing it to escape through the riser.

Itis with the above fact in View that I have devised the present mold which is provided with a lip or dam which projects downwardly from the top of the runner at its entry to the mold cavity and which acts to defiect the inolten metal downwardly so that the bottom portion of the mold cavity is bound to be filled before any of the metal can reach the top portion, air pockets being consequently prevented from forming.

With the above and other objects and advantages in view. the invention consists in the details of construction to be hereinafter more fully described and claimed and illustrated in the accompanying drawings in WhlCh-- Figure 1 is a longitudinal vertical section through a mold embodying my invention.

Figure 2 is @detail section on a larger scale showing a slight modification.

Referring more particularly to the drawings, I have shown a mold consisting of the usual upper and lower sections A and B, respectivelv` Which may be held in registration by any desired means, not shown. The

Serial No. 625,148.

letter C represents the mold cavity and E and F designate the runners which communicate with the sprue and riser G and H, respectively.

In carrying out my invention I provide a small Hange. lip or dam 10 located within and projecting downwardly from the top of the runner E at its juncture with the mold cavitv` this projection partially obstructing the runner. In Figure 1 this projection or dam is shown as being formed integrally with the mold while in Figure 2 I have shown the dam as consisting of an insert 11 fitting within a suitable slot 12 in the mold body In the use of the device it will be seen that when the metal is poured through the sprue it will not flow directly in a straight line from the runner E into the cavity C but will. upon striking the dam, be defiected downwardly in an inclined direction. It is thus manifestly impossible for the molten metal to shoot across the cavitv at the top thereof. On the other hand the metal* must fill the. bottom of the mold cavitv before it can possibly reach the top thereof. During this action it is obvious that there is no chance of any air being imprisoned within the mold and forming pockets.

lVhile I have shown and described the preferred embodiment of my invention` it i s of course to be understood that I reserve the right to make such changes in the form. construction and arrangement thereof as will not depart fro-m the spirit of the invention or the scope of the subjoined claims.

I claim:

1. In a mold, a project-ion extending downwardly from the top of the runner at a point. in advance of the. mold cavity.

2. In a molch a dam in the runner in advance of its juncture with the mold oavitv.

3. In a mold, a dam projecting downwardly from the top of the inlet runner in advance of the mold cavity and pertially obstructing the runner.

4. In a mold` a defiector for mo'lten metal poured thereinto. consisting of an insert located Within the inlet runner and projecti ng downwarclly from the top thereof.`

5. In a mold. a defiector for molten metal poured thereintoi consisting of an insert located Within the inlet runner and projecting downwardly from the top thereof, said insert being located immediately at the juncture of the runner with the mold cavity.

6. In a. mold, a` deflector for molten metal poured thereinto comprising M1 insert 10- cated Within the inlet runner at its juneture With the mold cavity' and projecting do wnwzu'dly from the top of the runner, said i11- sert 'extending partially across the runner and being formed as a. removable piece. l

111' test-11110113 whereo f I hereto' affiX my signature.

MONROE CLAWSON. 

